Shaper blade holder



Aug. 29, 1950 E. A. CHRISTENSON SHAPER BLADE HOLDER Filed March 19, 1948 INVENTOR.

Wmmm /8 7 W HTTP Patented Aug. 29, 1950 U N il-z'l? ED ES ENST OFFICE.

SHAPER BLAmrHoenER Edward AliCH-lis'tenson, LosvAngeles-,-;Galif.

Application March-.19, 1948, Serial No: 15 ;89'2" 1 Claim. 1

Tlfe present inventionr'elates' to a shaperblade' liolderlp'artic ularly adaptable foruse in any conv'eiitiona'l "drill press.

One of the principal.objectsiofithe invention is tolprovidethe. home. workshop. or the. small cabinet shop witlia blade. holder. capable of. selectively holding any one of' a set ofsh'aper blades whose cutting edges differ in contour whereby both inside and outside fancy edge work may be shaped by the operator in accordance with the particular blade suited for performing such operation.

A further object resides in the new mode of assembling and the peculiar manner in which the assembled parts cooperate to perform new and unobvious results.

A further object is to provide a blade holder which is much cheaper and easier to manufacture, quicker to install, change blade and make adjustments.

A further and more specific object is to provide a blade holding tool having a reduced lower end portion providing a seat for a case hardened collar toresist wear from work held thereagainst being operated upon, said collar being a new element in a combination to support a cutting blade mountable in a transverse slot a portion of which is superjacent the collar.

The invention further contemplates the use of a safety shield mountable upon the blade holder and projecting outwardly so as to completely overlie the full sweep of the blade.

Other objects, advantages and features of invention will hereinafter appear.

Referring to the drawing wherein is shown a preferred embodiment of the invention as now being manufactured:

Fig. 1 is a perspective view of the blade holding device operatively installed in the chuck of a drill press, fragmentary portions of the drill press, work table and work being operated upon being included in the view as well as a safety guard associated with the tool.

Fig. 2 is an enlarged side elevation of the blade holder, a portion being broken away to disclose interior construction.

Fig. 3 is a fragmentary vertical section indicated by line 3-3 in Fi 2.

Figs. 4 and 5 are transverse sections taken respectively on lines 44 and 5-5 of Fig. 3.

Fig. 6 is a perspective view of the lower end of the shaft portion only of the device illustrating the manner of slotting and reducing such end portion.

Fig. 7 is a side elevation of a plurality of blade being juxtapositioned in relationr-to; agworka pieceiand depictingsthe=workperformed byzsnch blade; the three bottom :views 'c'omprisingrthecseti illustrating how :a .tongue. and groove: j ointxm'ayz be constructed through the; use 10f a singleblades.

Referring in :detail tethe drawing the zn-umeral 8 indicates the blade holder mountable upon a chuck e of a drill press id partially shown. A longitudinal slot ll is diametrically cut into one end portion of the cylindrical shaft forming the blade holder, said slot extending well into the shaft body to provide not only space wherein to mount the cutter blade [2 but also room wherein to drive the pins is to provide an auxiliary support for the blade when the latter is not fully supported by the ring 54.

The slotted end portion of the shaft is diametrically reduced by cutting thereinto a circumferential groove or recess 15 wherein to mount the ring M to prevent spreading apart of the reduced end portions l6 and H, see Fig. 6, as a result of forming the longitudinal slot H therein. Said groove is is cut to a depth equal to the thickness of the ring so that when the latter is in its mounted position the faces of the ring and shaft will be flush.

The ring is constructed of case hardened steel to resist wear as the work being operated upon by the blade l2 is always held abuttingly thereagainst and the pins H3 in addition to performing the function already stated maintain the ends l6 and I! in their fully spread apart condition so as to provide a constant width of the slot H in order to prevent binding of the blade l2 when being inserted or removed. After the ring 54 is mounted in the position shown in Fig. 2 and the pins l3 driven home the end portions of the split parts [6 and I1 are peened over the end of the ring as indicated by the numeral 18 in the latter view to securely hold the ring in its mounted position.

Vertically alined holes l9 and 2B are tapped into the diametrically unreduced portion of the shaft, at one side of slot H, for the reception of screws 2| and 22 to hold the blade in its mounted posi-- tio within the slot ll.

Commenting briefly on the manufacture and assembly of the parts, the lower end portion of the shaper blade holder is first turned down to the desired length and diameter. Then the slot II is milled to the desired width and length for inserting the shaper blades with a working fit. Next the ring [4 is made and assembled into the annular recess and the two pins l3 preferably,

3 of the alligator type are driven into the slot to retain the proper spacing for the blade and also to provide a rest for the blade when it is projected so far on one side as to unseat the end opposite the blade from its rest position on the collar, such projection of the blade being necessary in cutting the horizontal edge as indicated by the numeral 23 in Fig. '7. Then the ends of the split end portions l6 and [T are peened over the end of the collar M as indicated at 58 in Fig. 2. Finally the holes 19 and 26 are drilled and tapped for the socketed screws 2| and 22. Incident to placing the blade in position in the holder the annular guard 24 is slipped over the end of the holder and set-screwed in position to accommodate the work piece 25 being operated upon,

which is Supported upon the work table 26.

I claim:

A holder for supporting a shaper blade cornprising a cylindrical shaft having a longitudinal slot diametrically cut into one end thereof, such slotted end of said s'naft having its outer end portion diametrically reduced, and a collar mounted on said reduced portion with its outer surface flush with the unrednced portio of said shaft, the resulting split end portions of the shaft being peened over the outer end of said collar to hold the latter in place, at least one pin being driven into the slot to maintain the spaced apart walls of the slot parallel for the insertion and Withdrawal of a shaper blade.

E-DXVARD A. CHRISTENSON.

REFERENCES CITED The following references are of record in the file of this patent: V

UNITED STATES PATENTS Number Name Date 14,263 Towne Feb. 12, 1856 687,401 Morse Nov. 26, 1901 752,863 Roberge et al. Feb. 23, 1904 828,706 Bohling et a1 Aug. 14, 1906 1,047,466 Wagner Dec. 17, 1912 2,234,477 Marshall Mar. 11, 1941 FOREIGN PATENTS Number Country Date 130,870 Germany May 5, 1902 45,896 Denmark July 4, 1932 OTHER REFERENCES American Machinist, July 18, 1946, pages 144- 145 (Atzrotts undercutting tool). 

